Stuck in [Snape's office], [Harry] and [Ron] are forced to try to explain their actions, first by [Snape] and then by [McGonagall] and [Dumbledore]. They are admonished, given [detentions], and warned that farther misbehavior will warrant expulsion from [Hogwarts]. [McGonagall] then leaves them to eat dinner there before heading up to [Gryffindor Tower].

Chapter 6 - "Glideroy Lockhart" - In which Ron receives a Howler, they learn about mandrakes in Herbology, Colin Creevey asks for an autographed photo, Lockhart is the new Defence Against the Dark Arts teacher, and they learn about Cornish pixies.

[Colin Creevey] introduces himself to [Harry] and asks to have a photo taken and for [Harry] to sign it. [Malfoy] stops by to loudly make fun of [Harry], and then to poke fun at [Ron] at the same time.